package cn.com.ry.framework.application.meteor.framework.websocket;

import cn.com.ry.framework.application.meteor.framework.exception.ValidationException;
import cn.com.ry.framework.application.meteor.framework.ssh.SshSessionEntity;
import cn.com.ry.framework.application.meteor.framework.ssh.SshSessionFactory;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;

import javax.websocket.*;
import javax.websocket.server.PathParam;
import javax.websocket.server.ServerEndpoint;
import java.io.IOException;
import java.util.concurrent.CopyOnWriteArraySet;

@ServerEndpoint("/websocket/{sid}/{hostname}/{username}/{password}/{port}")
@Component
public class WebSocketServer {
    private Logger log= LoggerFactory.getLogger(WebSocketServer.class);

    //静态变量，用来记录当前在线连接数。应该把它设计成线程安全的。
    private static int onlineCount = 0;
    //concurrent包的线程安全Set，用来存放每个客户端对应的MyWebSocket对象。
    private static CopyOnWriteArraySet<WebSocketServer> webSocketSet = new CopyOnWriteArraySet<WebSocketServer>();

    //与某个客户端的连接会话，需要通过它来给客户端发送数据
    private Session session;
    //ssh
    private SshSessionEntity sshSessionEntity;

    //接收sid
    private String sid = "";

    /**
     * 连接建立成功调用的方法
     */
    @OnOpen
    public void onOpen(Session session, @PathParam("sid") String sid, @PathParam("hostname") String hostname, @PathParam("username") String username, @PathParam("password") String password, @PathParam("port") Integer port) {
        this.session = session;
        webSocketSet.add(this);     //加入set中
        addOnlineCount();           //在线数加1
        log.info("有新窗口开始监听:" + sid + ",当前在线人数为" + getOnlineCount());
        this.sid = sid;
        try {
            //创建ssh连接
            sshSessionEntity = SshSessionFactory.createSession(hostname, username, password, port, sid, session, null, null);
            sendMessage("");
        } catch (IOException e) {
            throw new ValidationException(e.getMessage());
        } catch (ValidationException e) {
            throw new ValidationException(e.getMessage());
        }
    }

    /**
     * 连接关闭调用的方法
     */
    @OnClose
    public void onClose() {
        webSocketSet.remove(this);  //从set中删除
        subOnlineCount();           //在线数减1
        SshSessionFactory.closeSession(sshSessionEntity);
        log.info("有一连接关闭！当前在线人数为" + getOnlineCount());
    }

    /**
     * 收到客户端消息后调用的方法
     *
     * @param message 客户端发送过来的消息
     */
    @OnMessage
    public void onMessage(String message, Session session) {
        //群发消息
        for (WebSocketServer item : webSocketSet) {
            try {
                String tmp_sid = item.sid;
                if (tmp_sid.equals(sid)) {
                    item.sendMessage(message);
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    /**
     * 错误信息
     *
     * @param session
     * @param error
     */
    @OnError
    public void onError(Session session, Throwable error) {
        log.error("发生错误");
        error.printStackTrace();
    }

    /**
     * 实现服务器主动推送
     */
    public void sendMessage(String message) throws IOException {
        sshSessionEntity.write(message);
    }

    /**
     * 群发自定义消息
     */
    public static void sendInfo(String message, @PathParam("sid") String sid) throws IOException {
        for (WebSocketServer item : webSocketSet) {
            try {
                //这里可以设定只推送给这个sid的，为null则全部推送
                if (sid == null) {
                    item.sendMessage(message);
                } else if (item.sid.equals(sid)) {
                    item.sendMessage(message);
                }
            } catch (IOException e) {
                continue;
            }
        }
    }

    public static synchronized int getOnlineCount() {
        return onlineCount;
    }

    public static synchronized void addOnlineCount() {
        WebSocketServer.onlineCount++;
    }

    public static synchronized void subOnlineCount() {
        WebSocketServer.onlineCount--;
    }
}
